HD (High Density) Pocket Springs or Micro springs are small pocket springs that many bed manufacturers use to vastly increase their mattress spring count. You can fit in thousands of these tiny springs in a mattress so you can sell a model as having 6000, 8000 or even 10,000 springs.
What are tiny springs used for?
Small springs are used in a wide array of applications and assemblies such as in appliances, electronic devices, medical equipment, and much more. The materials commonly used for small springs include music wire, stainless steel (types 302, 304, 316), spring brass, and phosphor bronze.
How small can springs be?
Micro torsion springs and small torsion springs can be made from wire diameters ranging from . 00275 to . 015 inches in wire diameter. Bends can be performed as well as radius and u-shapes on the legs of the micro torsion springs.